Combine multiple results in Javascript

In the javascript below I would like to combine multiple results. In this case Value2 - Value1 + Value4 - Value3

What I tied below returns an error:

SyntaxError illegal charater Line 9  value1) + (value4 - Value3)

// Get the values from the textboxes
var value1 = parseFloat(this.getField("RealEstate_Loan_1").value) || 0;
var value2 = parseFloat(this.getField("RealEstate_MarketValue_1").value) || 0;
var value3 = parseFloat(this.getField("RealEstate_Loan_2").value) || 0;
var value4 = parseFloat(this.getField("RealEstate_MarketValue_2").value) || 0;

// Perform the subtraction
var result = (value2 – value1) + (value4 – value3);

// Set the result in another field (e.g., ResultBox)
this.getField("RealEstate_NetValue_Total ").value = result.toFixed(2);